Installing in Pharo 8 raises MetacelloProjectSpecLoadError

[hernanmd]

Is the KerasWrapper supported in Pharo 8? I'm using macOS.
This is how I tried to install:

Gofer it
    smalltalkhubUser: 'ainfante' project: 'Keras-Wrapper';
    configurationOf: 'KerasWrapper';
    loadDevelopment.

Result:

MetacelloProjectSpecLoadError: No version found for #stable of ConfigurationOfOSSubprocess because: The symbolic version #stable is not defined in ConfigurationOfOSSubprocess for the current platform. Possible symbolic version values include: #(#bleedingEdge)